/* lrint() - S390 version.

   Copyright (C) 2019 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <https://www.gnu.org/licenses/>.  */

#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT

# include <math.h>

# include <libm-alias-double.h>

/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte).

   Thus we need different instructions as the target size is encoded there.

   Note: On s390 this instruction is only used if build with -mzarch.  */

# ifdef __s390x__

#  define INSN "cgdbra"

# else

#  define INSN "cfdbra"

# endif

long int

__lrint (double x)

{

  long int y;

  /* The z196 zarch "convert to fixed" (cgdbra) instruction is rounding

     according to current rounding mode (M3-field: 0).

     First convert x with suppressed inexact exception and check if the

     resulting value is beyond the target limits (indicated by cc=3;

     Note: a nan is also indicated by cc=3).

     If the resulting value is within the target limits, redo

     without suppressing the inexact exception.  */

  __asm__ (INSN " %0,0,%1,4 \n\t"

	   "jo 1f \n\t"

	   INSN " %0,0,%1,0 \n\t"

	   "1:"

	   : "=&d" (y) : "f" (x) : "cc");

  return y;

}

libm_alias_double (__lrint, lrint)

#else

# include <sysdeps/ieee754/dbl-64/s_lrint.c>

#endif